From RE:Vision Effects:
Twixtor intelligently slows down, speeds up or changes the frame rate of your image sequences. In order to achieve its unparalleled image quality, Twixtor synthesizes unique new frames by warping and interpolating frames of the original sequence. Employing RE:Vision's proprietary tracking technology that calculates motion for each individual pixel.
What's new in this version:
Version needed to run in AE CC 2015 if you use splines to help guide Twixtor Pro (this version fixes a crashing bug).
Fixed a crashing bug with AMD FirePro series